first at a diner than a rally he said president obama wants to make sure medicare is around. >>> the action the president took strengthen medicare trust fund and exceeded its live up to 2024 >>> biden argued the republicans want to drastically change the program >>> that on want to tell you they're not for medicare there for a thing called a voucher care >>> and the vice presidential nominee hammered the obama administration for out of control borrowing and spending. >>> as a result the most of not fixing it our credit rating downgraded for first time in history >>> line said new hampshire's will help shape the election >>> get those people that promise to open change are demoralized now >>> the candidates prep for the first debate in practice sessions run it will get help from ohio senator who will play the role of the president president obama looks to massachusetts senator john kerry to stand in for romney. the debate at the university of denver will get both candidates a chance to explain their stance on the economy dru levenson cbs news >>> but first the date is wednesday in den